Taking the last 4 years and giving 1 pt for a draw 3 points for a win and dividing by number of games I get
NZ home: 2.76
India home: 2.47
Australia home: 2.42
SA home: 2
Pakistan home: 1.92
Sri Lanka home 1.82
England home: 1.75


SA away: 1.9
Oz away: 1.4
Sri away: 1.1
india away: 1.05
NZ away: 1.04
Pakistan away: 1
England away: 0.714

Adding it together my rankings would be
SA 3.9
Oz 3.82
NZ 3.8
India: 3.52
Paki: 2.92
Sri: 2.9
England 2.4